Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9cb49b593d2015…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 01:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2df362893fbc8d13726ccabd1b25149 SHA-1: 8bdf94af96d3d1215c3a3af0f38e46d15800244f SHA-256: 6c9cb49b593d2015cb013c71a0f7379b4dfdfaca55e02aaf2b8a3c4439220af8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's primary function is to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=order+fractions+with+different+denominators+worksheet PDF link annotation
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/sunudotowediso.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/22073163258.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d279930382---fuderupedupawefip.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/71830151567.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/vujowerawosa.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/wumarolabit.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa93b013903c0f8bb2d5f318fa4f5b80/74468059008.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e03a2450e---lejelirogunubut.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ceb856b46---fawapasugipamesak.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/27991858230.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/85590102651.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/mdgmr2und1vvbsocev8vi2vt7e/83096575905.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/kpvlf8vc7bmq16jhe12k36tc25/4889689378.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/zonezili.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c4ec5ec2---mubidonezotizo.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/rupub.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56b7858cc---94362894894.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/42508636063.pdfIn PDF document text
    • http://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/vuzenolitigajimigafo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8151b94d---61055370441.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/99957235896.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/83081425512.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/k5t49jjliuj5h5asr59jfb32b0/54482339413.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/taxamozupo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 17600 bytes
SHA-256: 56410f83d090fe419f3842c777045667df9ac264e922870b47b6089b151c7976
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 10900 bytes
SHA-256: 369b92d32c4371a0918ad3ea4b5efdc52cb2dbf3371809802f94532cedbe9b71

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